CN217055807U - Hydraulic cylinder and working machine - Google Patents

Abstract

The utility model relates to a hydraulic component technical field provides a pneumatic cylinder and operation machinery. The hydraulic cylinder comprises a cylinder body, a piston rod and a primary buffer structure; the first-level buffer structure comprises: the guide piece is slidably arranged in the cylinder body and slidably sleeved on the piston rod, one end, close to the piston, of the guide piece can abut against the piston, the guide piece is provided with a buffering inclined plane, and the buffering inclined plane gradually inclines towards the direction close to the piston rod from one end, close to the piston, of the piston rod to the end far away from the piston; the sliding block is connected with the cylinder body in a sliding manner along the radial direction of the cylinder body and is abutted against the buffer inclined plane; and the first elastic piece is respectively connected with the cylinder body and the sliding block and is used for driving the sliding block to the direction close to the guide piece. Under the effect of one-level buffer structure, the slider provides resistance for the guide to slow down the speed of piston, and then avoid piston and cylinder body to take place the striking and produce vibration and noise, in order to prevent that the pneumatic cylinder from damaging.

Description

Hydraulic cylinder and working machine

Technical Field

The utility model relates to a hydraulic component technical field especially relates to a pneumatic cylinder and operation machinery.

Background

The hydraulic cylinder is a hydraulic actuator which converts hydraulic energy into mechanical energy and makes linear reciprocating motion. When the piston moves to the tail end of the stroke of the cylinder barrel along with the piston rod, the piston can collide with the sealing cover, so that the hydraulic cylinder generates larger noise and vibration, and the hydraulic cylinder is damaged

Therefore, how to solve the problem that the piston is easy to collide with the cylinder head is a technical problem that needs to be solved urgently by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The utility model provides a pneumatic cylinder and operation machinery for solve among the prior art defect that the piston collides with the cylinder cap easily, realize cushioning the piston, prevent the effect that piston and cylinder cap collided.

The utility model provides a hydraulic cylinder, which comprises a cylinder body, a piston rod and a primary buffer structure; the primary buffer structure includes:

the guide piece is slidably arranged in the cylinder body and slidably sleeved on the piston rod, one end, close to the piston, of the guide piece can abut against the piston, the guide piece is provided with a buffering inclined plane, and the buffering inclined plane gradually inclines towards the direction close to the piston rod along the direction from one end, close to the piston, of the piston rod to the end, far away from the piston, of the piston rod;

the sliding block is connected with the cylinder body in a sliding manner along the radial direction of the cylinder body, and the sliding block is abutted against the buffer inclined plane;

the first elastic piece is respectively connected with the cylinder body and the sliding block and used for driving the sliding block towards the direction close to the guide piece.

According to the utility model provides a hydraulic cylinder, still include the secondary buffer structure, the secondary buffer structure includes the second elastic component;

the second elastic piece is arranged in the cylinder body, a first end of the second elastic piece is connected with the cylinder body, a second end of the second elastic piece can abut against the guide piece, and the second elastic piece is used for driving the guide piece to one end, close to the piston, of the guide piece.

According to the utility model provides a hydraulic cylinder, which also comprises a sliding part and a positioning structure;

the sliding part is sleeved between the guide part and the piston rod and is respectively in sliding fit with the guide part and the piston rod;

the positioning structure is connected with one end, close to the piston, of the guide piece, the positioning structure is sleeved on the piston rod, a gap is formed between the positioning structure and the piston rod, and the positioning structure and one end, close to the piston, of the sliding piece can be switched between a propping state and a spacing state.

According to the utility model provides a pair of hydraulic cylinder, the slider is close to the outer periphery of the one end of piston is equipped with the annular flange, the guide is equipped with the confession the ring channel that the annular flange was put into.

According to the utility model, the annular flange is provided with the pressure relief hole which is arranged along the axial direction of the sliding piece in a through way;

the pressure relief hole is arranged opposite to a gap between the sliding piece and the guide piece.

According to the utility model provides a hydraulic cylinder, further comprising a second elastic member;

the second elastic piece is arranged in the cylinder body, a first end of the second elastic piece is connected with the cylinder body, a second end of the second elastic piece can be connected with the guide piece, and the second elastic piece is used for driving the guide piece to one end, close to the piston, of the guide piece.

According to the utility model provides a hydraulic cylinder, the guide piece includes the uide bushing suit in the piston rod and suit in the sliding ring of uide bushing, the buffering inclined plane sets up in the sliding ring;

the guide sleeve is provided with a shaft shoulder which is abutted against one end, close to the piston, of the sliding ring.

According to the utility model provides a hydraulic cylinder, still include the guide bar that is connected with the cylinder body, the first elastic component and the slider all suit in the guide bar;

the sliding ring is provided with a wedge-shaped block, the inclined plane of the wedge-shaped block is arranged to be the buffering inclined plane, the wedge-shaped block is provided with a sliding groove for the guide rod to stretch into, and the sliding groove extends along the axial direction of the piston rod.

According to the utility model provides a pair of hydraulic cylinder, the slider with between the piston rod the slider with between the guide and the guide with all be equipped with sliding seal structure between the cylinder body.

According to the utility model provides a hydraulic cylinder, the positioning structure comprises a cushion pad and a fixed sleeve, the fixed sleeve is in threaded fit with the guide part, the cushion pad is arranged between the fixed sleeve and the sliding part, and the cushion pad is connected with the fixed sleeve;

and/or the sliding part comprises a free piston and a spacer bush, the free piston is arranged at one end close to the piston, and the spacer bush is arranged at one end far away from the piston.

The utility model also provides a working machine, include as above the pneumatic cylinder.

The utility model provides a pneumatic cylinder, through setting up one-level buffer structure, at the in-process that the piston rod stretches out, the piston can offset with the guide, piston drive guide synchronous displacement. In the moving process of the guide piece, the buffer inclined plane of the guide piece interacts with the sliding block, the buffer inclined plane drives the sliding block to move towards the direction far away from the piston rod, and the first elastic piece is compressed. Under the effect of first elastic component, the slider provides the resistance for the guide to slow down the speed of piston, and then avoid piston and cylinder body to take place the striking and produce vibration and noise, in order to prevent that the pneumatic cylinder from damaging, the life of extension pneumatic cylinder.

Specifically, the present invention provides a working machine, which includes the hydraulic cylinder, and therefore, includes all the advantages of the hydraulic cylinder.

Drawings

In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of a hydraulic cylinder provided in some embodiments of the present invention;

FIG. 2 is an enlarged view of a portion I of FIG. 1;

FIG. 3 is an enlarged view of a portion II of FIG. 2;

fig. 4 is a schematic view illustrating an installation state of the slider and the first elastic member according to some embodiments of the present invention

Fig. 5 is a schematic view of an arrangement of a slip ring and a wedge provided in some embodiments of the present invention.

Reference numerals are as follows:

1. a cylinder barrel; 2. a connecting member; 3. an end cap; 4. a gland; 5. a piston; 6. a piston rod; 7. a buffer bevel; 8. a slider; 9. a first elastic member; 10. an annular flange; 11. an annular groove; 12. a pressure relief vent; 13. a second elastic member; 14. a guide sleeve; 15. a slip ring; 16. a shaft shoulder; 17. a guide rod; 18. a wedge block; 19. a cushion pad; 20. fixing a sleeve; 21. a free piston; 22. a spacer bush; 23. a buffer ring; 24. a steel wire sleeve; 25. a chute; 26. a position limiting sleeve; 27. and (7) a hole shoulder.

Detailed Description

To make the objects, technical solutions and advantages of the present invention clearer, the drawings in the present invention will be combined to clearly and completely describe the technical solutions of the present invention, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The hydraulic cylinder provided in the embodiment of the present invention is described below with reference to fig. 1 to 5.

Specifically, the hydraulic cylinder comprises a cylinder body, a piston 5, a piston rod 6 and a primary buffer structure. The primary buffer structure comprises a guide part, a slide block 8 and a first elastic part 9.

Alternatively, the cylinder may comprise a cylinder barrel 1, a connector 2, an end cap 3 and a gland 4.

Referring to fig. 1, the cylinder 1, the connecting member 2, the end cap 3 and the gland 4 are connected in sequence from top to bottom, and any adjacent two may be connected by a threaded fastener.

Further, an oil port having a rod chamber may be provided on the connection member 2.

The piston 5 is slidably provided in the cylinder. Specifically, the piston 5 is slidably disposed inside the cylinder tube 1. A sliding sealing structure is arranged between the piston 5 and the cylinder barrel 1.

A first end of a piston rod 6 is connected to the piston 5 and a second end of the piston rod 6 extends from the cylinder. Specifically, the second end of the piston rod 6 passes through the connecting member 2, the end cap 3 and the gland 4 in sequence and extends out.

The guide is slidably disposed within the cylinder, and the guide is slidably fitted around the outside of the piston rod 6. The end of the guide near the piston 5 can be against the piston 5. The guide is provided with a buffering bevel 7, and the buffering bevel 7 gradually inclines towards the direction approaching the piston rod 6 from the end of the piston rod 6 approaching the piston to the end far away from the piston.

The sliding block 8 is connected with the cylinder body in a sliding way along the radial direction of the cylinder body, and the sliding block 8 is propped against the buffer inclined plane 7.

Optionally, the end cap 3 is provided with a hole shoulder 27 and a position-limiting sleeve 26, wherein a gap is formed between the position-limiting sleeve 26 and the hole shoulder 27, and the sliding block 8 is slidably arranged between the hole shoulder 27 and the position-limiting sleeve 26. Furthermore, one end of the position-limiting sleeve 26 abuts against the connecting piece 2, and the other end abuts against the protruding structure on the inner wall of the end cover 3, that is, the position-limiting sleeve 26 is pressed and fixed by the end cover 3 and the connecting piece 2, so that a space for the sliding of the sliding block 8 is formed between the position-limiting sleeve 26 and the hole shoulder 27.

The first elastic member 9 is connected to the cylinder and the slider 8, respectively, and the first elastic member 9 is used to drive the slider 8 in a direction close to the guide. For example, the first elastic member 9 may be provided as a spring.

Referring to fig. 1, in the embodiment of the present invention, the hydraulic cylinder provided in the embodiment of the present invention, through setting up the one-level buffering structure, in the process of extending the piston rod 6, the piston 5 can offset the guiding element, and the piston 5 drives the guiding element to move synchronously. In the process of moving the guide piece, the buffer inclined plane 7 of the guide piece interacts with the slide block 8, and the buffer inclined plane 7 drives the slide block 8 to move towards the direction far away from the piston rod 6 and compress the first elastic piece 9. Under the effect of first elastic component 9, slider 8 provides the resistance for the guide to slow down the speed of piston 5, and then avoid piston 5 and cylinder body to take place the striking and produce vibration and noise, in order to prevent that the pneumatic cylinder from damaging, the life of extension pneumatic cylinder.

Further, the angle between the damping ramp 7 and the direction of extension of the piston rod 6 is less than 45 °. With this arrangement, when the piston 5 travels a unit length distance in a state where the piston 5 abuts against the guide, the slider 8 travels a unit length distance less than the unit length, and the compression amount of the corresponding spring is less than the unit length. So, can carry out the flexible buffering to piston 5, avoid making piston 5 scram and losing the meaning of buffering too big to piston 5's buffering, can avoid piston 5 scram and produce the noise problem that hydraulic shock caused simultaneously.

Referring to fig. 4 and 5, further, the sliding blocks 8 and the first elastic members 9 are provided in plurality and are in one-to-one correspondence. The plurality of sliders 8 are uniformly distributed along the circumferential direction of the guide.

By such an arrangement, the buffering and decelerating effect on the piston 5 can be improved, and the stress on the piston 5 is uniform.

Referring to fig. 1, in some embodiments provided by the present invention, the outer surface of the guide is provided with a shoulder 16. The cylinder body is provided with a locating surface for abutment with the end of the shoulder 16 adjacent the piston 5. For example, the locating surface may be provided as an end surface of the end of the connector 2 adjacent the end cap 3.

So set up, at the in-process that piston rod 6 contracts along with piston 5, the guide resets and offsets with the locating surface under the drive of slider 8, through offsetting with connecting piece 2, can avoid the guide to continue the displacement along with piston rod 6 and lead to the problem that buffering inclined plane 7 and slider 8 break away from each other.

Referring to fig. 1, in some embodiments provided by the present invention, the guiding element includes a guiding sleeve 14 sleeved on the piston rod 6 and a sliding ring 15 sleeved on the guiding sleeve 14, and the buffering inclined plane 7 is disposed on the sliding block 8. The guide sleeve 14 can abut against the piston 5.

The shaft shoulder 16 is arranged on the guide sleeve 14, and one end of the slip ring 15 close to the piston 5 is abutted against the shaft shoulder 16.

The piston rod 6 can be guided by providing a guide sleeve 14. During the process of extending the piston rod 6, the piston 5 abuts against the guide sleeve 14 and pushes the guide sleeve 14 to move, and the shaft shoulder 16 of the guide sleeve 14 pushes the slide ring 15 to move, so that the buffer inclined plane 7 of the slide ring 15 drives the slide block 8 to compress the first elastic element 9. When the piston rod 6 retracts, the first elastic part 9 restores to deform and drives the sliding block 8 to displace, the sliding block 8 pushes the sliding ring 15 to move, and the sliding ring 15 pushes the shaft shoulder 16 to abut against the connecting piece 2.

With this arrangement, when the buffering inclined surface 7 is worn or damaged, only the slide ring 15 can be replaced without replacing the guide sleeve 14. Likewise, when the guide sleeve 14 is worn or damaged, only the guide sleeve 14 may be replaced without replacing the slide ring 15. Thus, the maintenance cost of the hydraulic cylinder can be reduced.

Further, in order to enable a better connection of the slide ring 15 to the guide sleeve 14, the slide ring can be reliably and accurately reset. Referring to fig. 3, the hydraulic cylinder further comprises a wire sleeve 24, and the wire sleeve 24 is sleeved on the guide sleeve 14 and abuts against one end of the sliding ring 15 far away from the piston 5. The slide ring 15 can always be displaced synchronously with the guide sleeve 14 by the interaction of the wire sleeve 24 and the shoulder 16.

In some embodiments of the present invention, the hydraulic cylinder further includes a second-stage buffering structure, and the second-stage buffering structure includes the second elastic member 13.

The second elastic element 13 is arranged in the cylinder, a first end of the second elastic element 13 is connected with the cylinder, a second end of the second elastic element 13 can abut against the guide element, and the second elastic element 13 is used for driving the guide element to one end of the guide element close to the piston 5.

Therefore, in the process of extending the piston rod, after the piston 5 pushes the guide part to be connected with the second elastic part 13, the piston 5 can be simultaneously buffered under the combined action of the primary buffer structure and the secondary buffer structure, and larger impact force can be effectively born, so that the piston 5 stops moving.

Referring to fig. 1, in some embodiments provided by the present disclosure, the hydraulic cylinder further includes a sliding member and a positioning structure.

The sliding part is sleeved between the guide part and the piston rod 6 and is respectively in sliding fit with the guide part and the piston rod 6. Specifically, the sliding member is fitted between the guide sleeve 14 and the piston rod 6, and the guide sleeve 14 guides the piston rod 6 via the sliding member.

The positioning structure is connected to the end of the guide member adjacent the piston 5. For example, the locating structure is connected to the end of the guide sleeve 14 adjacent the piston 5. The positioning structure is sleeved on the piston rod 6, and a gap is formed between the positioning structure and the piston rod 6. The positioning structure and the end of the slider close to the piston 5 can be switched between an abutting state and a spaced state.

Referring to fig. 1, the action principle includes: in the process that the piston rod 6 extends out, when the piston 5 does not abut against the guide sleeve 14, high-pressure hydraulic oil in a rod cavity enters between the positioning structure and the sliding piece from a gap between the positioning structure and the piston rod 6, at the moment, the sliding piece can abut against the gland 4 or the second elastic piece 13 of the cylinder body under the driving of the hydraulic oil, and the sliding piece and the positioning structure are in a spaced state.

When the piston 5 is abutted against the guide sleeve 14, the positioning structure moves towards the direction close to the sliding part, so that the spacing distance between the sliding part and the positioning structure is reduced, at the moment, hydraulic oil between the sliding part and the positioning structure is extruded, and enters the rod cavity from the gap between the positioning structure and the piston rod 6, and the hydraulic oil acts on the piston 5 and can play a role in buffering the piston 5.

When the positioning structure runs to the position where the distance between the positioning structure and the sliding part is zero, the positioning structure and the sliding part are in an abutting state, and at the moment, one end of the sliding part, which is far away from the piston 5, abuts against the cylinder body or the second elastic part 13, so that the positioning structure stops under the limit of the sliding part, and the piston 5 stops at the same time.

So set up, can utilize the hydraulic oil between location structure and the slider to play the effect of flexible buffering to piston 5, so, on the one hand can effectively avoid when piston 5 momentum is too big, slider 8 and buffering inclined plane 7 response lead to producing too big striking and lead to the problem of structural damage between each structure too fast. Meanwhile, the piston 5 can be prevented from suddenly stopping due to overlarge buffering generated by interaction of the sliding block 8 and the buffering inclined plane 7, and the oil cylinder is prevented from losing buffering significance due to rigid impact generated in the cylinder barrel 1.

Further, when the positioning structure is in a state of abutting against the sliding part, one end of the sliding part, which is far away from the piston, protrudes out of one end of the guide part, which is far away from the piston. So can make location structure and slider offset at the in-process that the piston rod stretches out to can discharge the hydraulic oil between location structure and the slider completely, and then form better buffering effect to the piston.

It should be noted that, as shown in fig. 1, for a hydraulic cylinder provided with a secondary damping structure, the sliding part may abut against the secondary damping structure, i.e. in this case, the guiding part abuts against the second elastic part 13 via the sliding part. For a hydraulic cylinder without a secondary buffer structure, the sliding part can abut against the cylinder body, that is, the guide part abuts against the cylinder body through the sliding part.

Alternatively, the second elastic member 13 is provided as a disc spring.

Furthermore, the gland 4 is provided with a mounting groove for mounting the belleville spring.

In some embodiments provided herein, the positioning structure includes a cushion pad 19 and a retaining sleeve 20.

The retaining sleeve 20 is threadedly engaged with the guide. For example, the end of the guide sleeve 14 close to the piston 5 is provided with an internal thread, the outer wall of the fixing sleeve 20 is provided with an external thread matching said internal thread, and the fixing sleeve 20 is screwed inside the end of the guide sleeve 14 close to the piston 5.

The cushion pad 19 is disposed between the sleeve 20 and the slider, and the cushion pad 19 is connected to the sleeve 20. For example, the cushion 19 may be connected to the sleeve 20 by means of a threaded fastener connection.

Because location structure needs often contradict each other with the slider, and the atress condition is comparatively complicated, through setting up location structure for blotter 19 and fixed cover 20, make blotter 19 as with slider complex part, make fixed cover 20 as the part of being connected with the guide, can be to the corresponding different materials of use of blotter 19 and fixed cover 20 on the one hand to satisfy the user demand better, on the other hand be convenient for corresponding part that the change is easy to damage, and need not to change all parts.

Referring to fig. 1 and 2, in some embodiments of the present invention, the outer circumference of the end of the sliding member near the piston 5 is provided with an annular flange 10, and the guiding member is provided with an annular groove 11 for the annular flange 10 to be inserted.

The contact area between the sliding piece and the positioning structure can be increased by arranging the annular flange 10, so that the stress condition between the positioning structure and the annular flange 10 is improved, and the damage of the positioning structure and the annular flange 10 is reduced.

Referring to fig. 1 and 2, in some embodiments of the present invention, the annular flange 10 is provided with a pressure relief hole 12 penetrating in the axial direction of the slider.

The relief hole 12 is provided opposite to the gap between the slider and the guide.

Through the arrangement of the pressure relief hole 12, on one hand, in the process of extending the piston rod 6, hydraulic oil between the annular flange 10 and the side wall of the annular groove 11 can be quickly discharged from the pressure relief hole 12, and the situation that the hydraulic oil between the annular flange 10 and the side wall of the annular groove 11 obstructs the movement of the sliding piece is avoided. On the other hand, when the annular flange 10 abuts against the side wall of the annular groove 11, hydraulic oil in a gap between the sliding part and the guide part can be discharged from the pressure relief hole 12, so that the problem that the gap between the sliding part and the guide part is instantaneously high-pressure formed to break down a sealing structure between the sliding part and the guide part due to the rapid abutment of the annular flange 10 and the side wall of the annular groove 11 is solved.

Referring to fig. 1, in some embodiments provided by the present disclosure, the hydraulic cylinder further includes a cushion ring 23. A damping ring 23 is connected to the end of the positioning structure near the piston 5. That is, the positioning structure abuts against the piston 5 via the cushion ring 23.

For example, the cushion ring 23 may be connected to the guide sleeve 14 by a threaded fastener, and the cushion ring 23 abuts the retaining sleeve 20. The cushion ring 23 has a clearance with the piston rod 6.

By providing a damping ring 23, as shown in fig. 1, it is on the one hand facilitated that the guide engages against the piston 5 via the damping ring 23. On the other hand, after the buffering ring 23 is arranged, in the process that the guide sleeve 14 is extruded, hydraulic oil between the sliding part and the positioning structure needs to sequentially pass through a gap between the positioning structure and the piston rod 6 and a gap between the buffering ring 23 and the piston rod 6 and then enters the rod cavity, so that the running path of the hydraulic oil is prolonged, the discharge resistance of the hydraulic oil between the positioning structure and the sliding part is increased, and the buffering effect on the piston 5 is improved.

Referring to fig. 1, 3 and 4, in some embodiments of the present invention, the hydraulic cylinder further includes a guide rod 17 connected to the cylinder body. The first elastic element 9 and the slide block 8 are sleeved on the guide rod 17. The first elastic member 9 and the slider 8 can be prevented from displacement play by fitting the first elastic member 9 and the slider 8 to the guide rod 17.

The sliding ring 15 is provided with a wedge block 18, the inclined surface of the wedge block 18 is set as a buffering inclined surface 7, the wedge block 18 is provided with a sliding groove 25 for the guide rod 17 to extend into, and the sliding groove 25 extends along the axial direction of the piston rod 6. The guide rod 17 extends into the sliding groove 25, so that the problem that the sliding ring 15 rotates around the guide piece to cause the displacement of the wedge block 18 and the sliding block 8 can be prevented.

Further, the number of the wedge blocks 18 is set to be plural and corresponds to the slide block 8 one by one.

Referring to fig. 1, in some embodiments provided by the present invention, sliding sealing structures are disposed between the sliding member and the piston rod 6, between the sliding member and the guide member, and between the guide member and the cylinder body. Through setting up sliding seal structure, can prevent to have the hydraulic oil in the pole intracavity to leak from any one of above three to improve the sealed effect of pneumatic cylinder.

Referring to fig. 1, in some embodiments provided by the present invention, the slider includes a free piston 21 and a spacer 22. The free piston 21 is disposed near one end of the piston. For example, the free piston 21 is intended to abut against a positioning structure. A spacer 22 is provided at the end remote from the piston. The spacer 22 is intended to abut against a cylinder, for example. For example, a fitting size is provided between the free piston 21 and the piston rod 6, and the sliding seal structure is provided between the free piston 21 and the piston rod 6. While spacer 22 may not be provided with a matching dimension with piston rod 6, e.g. a gap is provided between spacer 22 and piston rod 6, spacer 22 being used only for force transmission.

With this arrangement, the machining accuracy of the free piston 21 can be improved, and the machining accuracy of the spacer 22 can be reduced. Thus, on the one hand, the processing difficulty and the processing cost of the sliding part can be reduced, and on the other hand, after the free piston 21 or the spacer 22 is damaged, the damaged part can be replaced without replacing the whole sliding part.

The utility model also provides an operation machine.

Specifically, the work machine includes the hydraulic cylinder as described above.

It should be noted that the work machine includes the hydraulic cylinder and also includes all the advantages of the hydraulic cylinder, and the description thereof is omitted.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims (10)

1. The utility model provides a hydraulic cylinder, its characterized in that, includes cylinder body, piston rod and one-level buffer structure, one-level buffer structure includes:

the guide piece is slidably arranged in the cylinder body and slidably sleeved on the piston rod, one end, close to the piston, of the guide piece can abut against the piston, the guide piece is provided with a buffering inclined plane, and the buffering inclined plane gradually inclines towards the direction close to the piston rod from one end, close to the piston, of the piston rod to the end far away from the piston;

the sliding block is connected with the cylinder body in a sliding manner along the radial direction of the cylinder body and abuts against the buffer inclined plane;

the first elastic piece is respectively connected with the cylinder body and the sliding block and used for driving the sliding block towards the direction close to the guide piece.

2. The hydraulic cylinder of claim 1, further comprising a secondary dampening structure comprising a second resilient member;

the second elastic piece is arranged in the cylinder body, a first end of the second elastic piece is connected with the cylinder body, a second end of the second elastic piece can abut against the guide piece, and the second elastic piece is used for driving the guide piece to one end, close to the piston, of the guide piece.

3. The hydraulic cylinder of claim 1 or 2, further comprising a slide and a positioning structure;

the sliding part is sleeved between the guide part and the piston rod and is respectively in sliding fit with the guide part and the piston rod;

the positioning structure is connected with one end, close to the piston, of the guide piece, the positioning structure is sleeved on the piston rod, a gap is formed between the positioning structure and the piston rod, and the positioning structure and one end, close to the piston, of the sliding piece can be switched between a propping state and a spacing state.

4. The hydraulic cylinder according to claim 3, wherein the outer circumferential surface of the sliding member at an end thereof adjacent to the piston is provided with an annular flange, and the guide member is provided with an annular groove into which the annular flange is fitted.

5. The hydraulic cylinder according to claim 4, wherein said annular flange is provided with a relief hole provided through axially of said slider;

the pressure relief hole is arranged opposite to a gap between the sliding piece and the guide piece.

6. The hydraulic cylinder of claim 1, wherein the guide member comprises a guide sleeve fitted to the piston rod and a slip ring fitted to the guide sleeve, and the buffering slope is provided to the slip ring;

the guide sleeve is provided with a shaft shoulder, and the shaft shoulder is abutted to one end, close to the piston, of the sliding ring.

7. The hydraulic cylinder of claim 6, further comprising a guide rod connected to the cylinder body, wherein the first elastic member and the sliding block are both sleeved on the guide rod;

the sliding ring is provided with a wedge-shaped block, the inclined plane of the wedge-shaped block is arranged as the buffering inclined plane, the wedge-shaped block is provided with a sliding groove for the guide rod to extend into, and the sliding groove is arranged along the axial extension of the piston rod.

8. The hydraulic cylinder of claim 3, wherein sliding seal structures are provided between the slide and the piston rod, between the slide and the guide, and between the guide and the cylinder block.

9. The hydraulic cylinder of claim 3, wherein the positioning structure comprises a cushion pad and a sleeve, the sleeve is threadedly engaged with the guide, the cushion pad is disposed between the sleeve and the slide, and the cushion pad is connected to the sleeve;

and/or the sliding part comprises a free piston and a spacer bush, the free piston is arranged at one end close to the piston, and the spacer bush is arranged at one end far away from the piston.

10. A work machine, characterized by comprising a hydraulic cylinder according to any one of claims 1-9.

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